What impressed me most was the architecture of San Francisco. It's very beautiful. The whole San Francisco is a European style building. One residential area after another is a small attic. There are many mountains. The feet ache when climbing, but it's worth it. All the buildings are very beautiful, and after a while there will be one or two particularly bright buildings, leisure time, suitable for stopping and walking around. There's one or two cafes and it's nice to order an Irish coffee. The air is fresh and you can see the Golden Gate Bridge directly from a distance.